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Auto merge of #101679 - compiler-errors:rpitit-default-body, r=nikomatsakis

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Support default-body trait functions with return-position `impl Trait` in traits

Introduce a new `Trait` candidate kind for the `ImplTraitInTrait` projection candidate, which just projects an RPITIT down to its opaque type form.

This is a hack until we lower RPITITs to regular associated types, after which we will need to rework how these default bodies are type-checked, so comments are left in a few places for us to clean up later.

Fixes #101665
This commit is contained in:
bors 2022-10-12 21:03:47 +00:00
commit 0938e1680d
14 changed files with 166 additions and 129 deletions
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5
compiler/rustc_hir_analysis/src/collect/type_of.rs
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@ -340,10 +340,9 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: DefId) -> Ty<'_> {
..
}) => {
if in_trait {
span_bug!(item.span, "impl-trait in trait has no default")
} else {
find_opaque_ty_constraints_for_rpit(tcx, def_id, owner)
assert!(tcx.impl_defaultness(owner).has_value());
}
find_opaque_ty_constraints_for_rpit(tcx, def_id, owner)
}
ItemKind::Trait(..)
| ItemKind::TraitAlias(..)